#!/usr/bin/perl -w

# Takes a unix mailbox file on stdin,
# spits it out on stdout, minus the
# FOLDER INTERNAL DATA message

my $msg = "";
my $msgnum = 0;
my $skip = 0;
while(<STDIN>) {
	if (/^From .+/) {
		# Start of new message

		if ($msgnum == 1 and $skip == 0) {
			# First message was not FOLDER INTERNAL DATA,
			# so send it on unchanged
			print $msg;
		}

		$msgnum++;
		$skip = 0;
	}

	if ($msgnum > 1) {
		# Only bother looking at first message in mailbox
		# for FOLDER INTERNAL DATA message
		print;
		next;
	}
	else {
		if (/^Subject: DON'T DELETE THIS MESSAGE -- FOLDER INTERNAL DATA$/) {
			# Don't transmit this message
			$skip = 1;
		}
		$msg .= $_;
	}
}